Need Help!- 087 alarm

[kirby]

Came in this morning after severe lightning here last night and now i am getting an 087 alarm. We have a bad electrical smell in the shop but not around the cnc itself.

Acorrding to the fanuc OM manual a 087 alarm is" Buffer Overflow" and consisits of " When entering data in the memory by using Reader/Puncher interface though the read terminate command is specified, input is not interrupted after 10 characters read. I/O unit or P.C.B is defective."

Is this as bad as it sounds? It will run the program for a bit, sometimes for one entire tool and sometimes it only runs for a few seconds before it alarms out.

Also the machine was powered down last night and shut off at the breaker on the wall so i am not exactly sure this was caused by lightning.

[Timatnorthline]

If it's an intermittent fault and there is a smell of "electric" in the air, the first thing I would check is the logic power supply voltages. (Also check for ac ripple). If a cap has gone bad, (leaked) it could cause very strange alarms.

[memoryman]

Lower the baud rate at both sides- the problem may be in the computer.
Also, the 75188/751899 communication chips on the display board may be damaged. You can get these at Digikey.

[kirby]

Originally Posted by Timatnorthline If it's an intermittent fault and there is a smell of "electric" in the air, the first thing I would check is the logic power supply voltages. (Also check for ac ripple). If a cap has gone bad, (leaked) it could cause very strange alarms.

i have found out that it was a machine close to the cnc that has the burnt smell...it got the surge as the breaker wasnt off..

as far as ac ripple and a cap going bad can you simplify that a bit as i am not the best with electrical terminoligy...

I can say we checked the supply from the transformer to the machine and we are reading 210V and the machine is calling for 220V

[jimmy111]

I had a simmilar problem a few years ago. The machine had been working fine for years at 9600 then suddenly i had to reset it to 4800 to get it to accept data.
If you are feeding it with a PC and DNC, Id check the PC. Buffer overflow in my experience is a problem with comminucations thru the RS323 and the CNC controller. Basicly it means that either the PC is sending info too fast to the controller or the controller cant process it fast enough.

[kirby]

Originally Posted by jimmy111 I had a simmilar problem a few years ago. The machine had been working fine for years at 9600 then suddenly i had to reset it to 4800 to get it to accept data. If you are feeding it with a PC and DNC, Id check the PC. Buffer overflow in my experience is a problem with comminucations thru the RS323 and the CNC controller. Basicly it means that either the PC is sending info too fast to the controller or the controller cant process it fast enough.

we tried the fifo control buffer on the computer...will try to change the baud rate..its at 4800 now...

[memoryman]

4800 usually works well on the FS6; just try 2400.

[kirby]

Originally Posted by memoryman 4800 usually works well on the FS6; just try 2400.

can someone refresh me on how to change the parameter on the machine to switch from 4800 to 2400 baud? i used to know but i cant remember....

[jimmy111]

Parameter 0103. Change it to 9 for 2400. 10 for 4800 and 11 for 9600
It should come up in a few screens after you go to PWE then page down.

That was for 0i-m

Om I think it is parameter 0552

[memoryman]

parameter write enable (PWE) switch to ON (top of motherboard)
select MDI mode , maybe E-STOP too. Press P and
parameter 310 for i/o device 1: set bit 0 to 0 (leave other bits unchanged)
parameter 311 for i/o device 2: set bit 0 to 0 (leave other bits unchanged)
parameter 312 for i/o device 3: set bit 0 to 0 (leave other bits unchanged)
parameter 313 for i/o device 4: set bit 0 to 0 (leave other bits unchanged)
turn PWE off

[kirby]

Originally Posted by jimmy111 Parameter 0103. Change it to 9 for 2400. 10 for 4800 and 11 for 9600 It should come up in a few screens after you go to PWE then page down. That was for 0i-m Om I think it is parameter 0552

Yes..it is 552 on the OM and i think 553 if it is set on a different port.. But i changed one and or both to 9 , then changed the baud rate on my DNC... But all i could get was a 128 alarm which is saying " illegal macro sequence number" " The sequence number specified in the branch command was not 0 to 9999 or it cannot be searched. Modify the program."


If i switch it back i get the same 087 alarm... and i have ran the program a dozen times befor this.. It starts out
%
O0

which should be fine..

[kirby]

also, has anyone ever heard of a high frequency welder affecting a CNC? I have a welder about 50 ft away and was told it can mess up a CNC. Considering the amount of trouble i have had with this machine it is something i want to find out about...